The parseInt() method starts with the character in position 0 and determines if this is a valid number | |
If it isn't, the method returns NaN and doesn't continue. | |
If it is valid, the method goes on to the character in position 1. | |
This process continues until a character isn't a valid number. | |
parseInt() takes the string up to that point and converts it into a number. | |
parseInt("1234AAA") returns 1234 because it stops processing one it reaches the character A. | |
Any number literal contained in a string is also converted correctly. | |
The string "0xA" is properly converted into the number 10. | |
The string "22.5" will be converted to 22, because the decimal point is an invalid character for an integer. | |
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